This is the connection to the fence. It happens to be a u bracket mount for adjustable case feet. The foot thread was perfect for the fence bolt. The other end already had a concentric hole so I used it to mount the threaded rod.
The half nut capture block is the secret to fast setting and precise positioning. Notice the square block at the end. It is marked 0, 1/64, 1/32, 3/64 because the rod is 3/8 - 16. With the fence barely touching the (stationary) saw blade and the square block at "zero up", the capture block is secured to the fence rail with the lower wing nut. Then the fence is ready to be precisely positioned at the desired measurement, time after time.
The split nut is half of a threaded coupling super glued into the shaped block. The spring pushes the nut off the bar with 3 half twists of the wing nut allowing the fence to move about 30:" because the rod is 36". A longer rod could be used. The cursor on the fence gets me close and the tightened half nut puts the fence precisely. Micro adjustments can then be made if needed by twisting the square on the end of the rod.
Dan is an experienced woodworker who is anxious to make an heirloom of the future for you.